[Bug 294984] Kernel panic in udp6_send when underlying interface disappears

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=294984

--- Comment #6 from Gleb Smirnoff <[email protected]> ---
(In reply to Bjoern A. Zeeb from comment #4)
> What's the reason the change doesn't get merged to stable/15?
> Given it's an extension to the struct it looks like it is totally fine.

While the given change indeed is the change that supposedly fixed the problem
and it indeed seems mergeable, the change heavily depends on earlier changes,
where a hardcoded 4.3BSD protocol attach to ifnet was refactored to
EVENTHANDLER(9). And that is a much more intrusive change.

Potentially, the epoch delayed free of protocol softc hanging off ifnet may be
crafted on top of stable/15, without preceeding refactorings. But that won't be
a merge of a well tested change. That would be a new, specific to stable/15
code. I'd rather not go this way until somebody does a very extensive testing
of it.

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